UI: Display Events registered by application

Registered by Georgy Okrokvertskhov

Each application exposes different events to react to external signals. User should be able to get http hook URL for each event.
I propose to have a tab on Environment page and inside each application details page. On Environment tab all events from all applications will be listed. I suggest a table like:
| Application| Event name | Event hook URL |
| MyApp | onScale | http://muranoapi/events/<env_id>/<app_id>/<signed_id>/onScale |
| MyApp | onUpgrade | http://muranoapi/events/<env_id>/<app_id>/<signed_id>/onUpgrade |
| MyApp | onBackup | http://muranoapi/events/<env_id>/<app_id>/<signed_id>/onBackup |

Blueprint information

Status:
Not started
Approver:
ruhe
Priority:
Undefined
Drafter:
Georgy Okrokvertskhov
Direction:
Needs approval
Assignee:
None
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

Related branches

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Gerrit topic: https://review.openstack.org/#q,topic:bp/ui-application-event-list,n,z

Addressed by: https://review.openstack.org/80717
    Add Action List Tab to Environments

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